Loading only what is needed.
WHAT IT DOES
Images below the visible area are not loaded until the visitor scrolls toward them.
WHY IT HELPS
A page with twenty images loads only the three the visitor sees initially.
The rest load as needed, or never, if the visitor does not scroll.
HOW TO ENABLE IT
Most current platforms do it automatically.
WordPress has done so by default for some time.
Caching and optimisation plugins offer it where the platform does not.
WHAT NOT TO LAZY LOAD
Images visible when the page first opens.
Lazy loading those delays them, which is worse.
Most implementations handle this automatically. Check that your main banner image is not affected.
WHAT TO WATCH FOR
Images that never appear, if the implementation is faulty Layout shifting as images load
FOR THAT SECOND PROBLEM
Specify image dimensions so the space is reserved before the image arrives.
WHEN IT MATTERS MOST
Long pages, galleries, and shop category pages.
